A western lowland gorilla munches on a monkey chow biscuit at the Chicago Zoological Society's Brookfield Zoo in Brookfield, Ill. Thanks to mounting research on wild animals' food needs, today's zoo staffers are trying new feeding tricks to keep their animals healthy and happy. The days of letting visitors throw marshmallows to the animals are mostly history at zoos around the country, replaced by a growing focus on diet and nutrition that parallels the nutrition craze in humans.
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